VAC1 Monitor Overflows & Underflows

[Kurt V.]

Dear all,

I have some questions regarding the Overflows and Underflows. 

Hardware setup overview:

I am using a pretty strong laptop,  i7-8750H CPU @ 2.20GHz with a NVIDIA GeForce GTX 1050 Ti. 24GB ram. This is a pretty powerful laptop. 

I have a direct ethernet connection between the HL and the laptop, no hub, no wifi. 

Audio input by a Behringer UMC22 U Phoria XLR to USB audio interface. 
Audio output to a USB sound blaster dongle (also tested with the original laptop speakers to eliminate the sound blaster dongle as a cause of the issue)

In the thetis settings, I have audio buffer size on default 2048 and Sample rate on default 48000. The microphone and sound card are all programmed for 48000 as well in the windows advanced tab so it matches the sample rate in Thetis. 
Buffer latency is all in auto mode (120 greyed out)

Issue:

No matter what I do, I have a substantial number of dropped audio frames and the Overflows and Underflows climb up. I give Thetis high priority. 

Thetis CPU usage is between 11 and 15%. System CPU usage is around 18 & 20%.

No other programs are running. CPU usage in windows task manager floats around 40%, of which 30% is used by thetis.

Just opening a simple browser will generate dropped audio frames instantly. 

Here are my questions:

1. what can cause these dropped audio frames having overflows and underflows go wild

2. the dropped frames also reflect in TX (even on the lowest power with a receiver nearby - excluding RFI), I can hear my TX audio having dropped audio frames. 

3. what is a typical dropped audio frame number when RX 10 minutes and using the computer lightly like just browsing the web. Should there be any overflows and underflows or not? 

Is there any documentation available regarding this subject? 

Kind reagards. 

ON7OFF

[Rick Langford (N8SDR)]

One thing to check- I suppose this laptop like most also has a WIFI adapter.

Change the Ethernet metrics priorities for the network adapters.

Making your wired Network adapter the lower value metric which will assign it greater propriety over the Wi-Fi connection.

That sound like a lot of processing is going on, looking here (although a fairly stout PC I bult Thetis is between 0 and 2 percent tops)

the GPU load is about 12% 

Also make sure your VAC is up to date older version of VAC alongside windows updates can be issues for poor performance with VAC in general.

How to change network adapter priorities on Windows 11 - gHacks Tech News

Also make sure you applied the Network Throttling fix as well.

Open the “Windows Registry Editor” and go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile. Then open the “NetworkThrottlingIndex” key, change “Value Data” to ffffffff, and click “OK.”

[Ron Lewkowicz]

There should be zero to near zero dropped frames and under runs.

When you use multiple sound devices they have different clocks.  Pro devices can be synced by an external word clock device, these devices cannot.  As a result resampling will be required to maintain sync.  I don't know how well windows can handle this or if it could create an issue but I might try just using UMC22 for both input/output and ditch the sound blaster.

Check where your CPU throttling setting is at.  Laptops often are setup to throttle heavily to extend battery life.  Mind you after looking up your CPU it looks like it can only drop to 1.7Ghz. 

[Kurt V.]

Dear  service...@gmail.com,

Not sure what is your QRZ, but the trick did the job. I have lost countless days to figure out what is the origin of the clipping in my TX and RX and this did the trick. 

Why not implement this registry modification automatically upon installation of Thetis. You are a genious. 

Kind regards. 

de ON7OFF

[Rick Langford]

Glad you got it working correctly.

Cheers

Rick N8SDR

--
You received this message because you are subscribed to a topic in the Google Groups "Hermes-Lite" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/hermes-lite/QYc98UKy4Wc/unsubscribe.
To unsubscribe from this group and all its topics, send an email to hermes-lite...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/hermes-lite/28c55b2d-91b6-4e1b-87f0-6969397a50c4n%40googlegroups.com.